Disinfecting, bactericidal, insecticidal, fungicidal, and vermin-destroying preparation



Patented June 24, 1930 i UNITED STATES PATENT OFFICE nUDoLF LIESKE, F LEYERKUSEN, NEAR COLOGNE, AND WILHELM SGHEPSS, or

-WIESDORF, NEAR COLOGNE, GERMANY, ASSIGNOBS, BY MESNE ASSIGNMENTS, 'ro

WINTHBOP CHEMICAL COMPANY, or NEW YORK, N. Y., A CORPORATION 01 NEW YORK DISINFEGTING, BACTERICIDAL, INSECTIGIDAL, FUNGICIDAL, AND VERMIN-DESTBOY- ING PREPARATION No Drawing. Application filed February 14, 1925, Serial No. 9,338, and in Germany April 10, 1924.

It is well known that basic dyestuffs such as triphenylmethane dyes (malachite green), oxazines (Meldola blue, Nile blue), thiazines (methylene blue), acridines (acridine yel- 5 low, benzoflavine), azine (safranine), azo dyes (e. g. Bismark brown), etc., act upon fungi and bacteria but not upon vermin, the dyestuffs being ordinarily used for this purpose in the form of oxalate of the respective dye base.

The subject of the present invention con sists in using the salts of such basic dyes with arsenious and arsenic acid, which have proved to be highly efficacious disinfecting,

ls'bactericidal, insecticidal and fungicidal products, while also being effective for use in exterminating vermin (rats, mice, sparrows etc.) and in spraying plants (vines etc.). An aqueous solution of the arsenate of malachite green for instance, even at a high dilution destroys mildew, oidium and other fungi etc. and is at the same time a powerful poison for animal pests. It has likewise been found advantageous in preserying wood by impregnation.

We claim 1. The herein described new disinfecting, bactericidal, insecticidal, fungicidal and vermin destroying preparations comprising a compound of malachite green and an acid ,of arsenic.

2. The herein described new disinfecting, bactericidal, insecticidal, fungicidaland vermin destro ing preparations comprising the arsenate o malachite green.

3. The process for disinfecting lants and killing vermin, which comprises t e use of a compound of malachite green with an acid of arsenic. v

o 4. The process for disinfecting plants and killirig vermin, which comprises the use of the arscnate of malachite green.

In testimony whereof we. have hereunto set our hands.

RUDOLF LIESKE. WILHELM SCHEPSS. 

